/**
 * Copyright 2010 - 2017 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus.entitystore;

import jetbrains.exodus.env.Transaction;
import org.jetbrains.annotations.NotNull;

class PersistentSequenceBlobHandleGenerator implements BlobHandleGenerator {

    @NotNull
    private final PersistentSequenceGetter sequenceGetter;

    PersistentSequenceBlobHandleGenerator(@NotNull final PersistentSequenceGetter sequenceGetter) {
        this.sequenceGetter = sequenceGetter;
    }

    @Override
    public long nextHandle(@NotNull final Transaction txn) {
        return sequenceGetter.get().increment();
    }

    interface PersistentSequenceGetter {

        PersistentSequence get();
    }
}
